servhelper | 6d6134155811eb82705509295bd4b87c6aaad43c1b54048c20d3cbf680494dfb

Analysis

max time kernel
87s
max time network
150s
platform
windows10_x64
resource
win10-en
submitted
10-09-2021 15:37

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General

Target

6d6134155811eb82705509295bd4b87c6aaad43c1b54048c20d3cbf680494dfb.exe
Size

4.0MB
MD5

9cadcadb612787dc6c2e9901ffe49dec
SHA1

dfaeffadd7767ea23cabc31a59ae2cd461abf00f
SHA256

6d6134155811eb82705509295bd4b87c6aaad43c1b54048c20d3cbf680494dfb
SHA512

e7d908a73e85965359169b9d3e14ec3f1f81218354aa09a8d6c027be230e30c4f334122b933579ce6ad35e5eaffc01c6d8124e5f1a11671b7f6b36549d55beff

Score

10^/10

servhelper xmrig backdoor miner persistence trojan

Malware Config

Signatures

ServHelper
ServHelper is a backdoor written in Delphi and is associated with the hacking group TA505.
trojan backdoor servhelper
xmrig
XMRig is a high performance, open source, cross platform CPU/GPU miner.
miner xmrig
Grants admin privileges 1 TTPs
Uses net.exe to modify the user's privileges.

Account Manipulation
T1098
Modifies RDP port number used by Windows 1 TTPs

Remote Desktop Protocol
T1076
Sets DLL path for service in the registry 2 TTPs
persistence

Registry Run Keys / Startup Folder
T1060

Modify Registry
T1112

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\rdpclip.exe	powershell.exe

Drops file in Windows directory 8 IoCs

description	ioc	Process
File created	C:\Windows\branding\mediasrv.png	powershell.exe
File created	C:\Windows\branding\mediasvc.png	powershell.exe
File created	C:\Windows\branding\wupsvc.jpg	powershell.exe
File opened for modification	C:\Windows\branding\Basebrd	powershell.exe
File opened for modification	C:\Windows\branding\ShellBrd	powershell.exe
File opened for modification	C:\Windows\branding\mediasrv.png	powershell.exe
File opened for modification	C:\Windows\branding\mediasvc.png	powershell.exe
File opened for modification	C:\Windows\branding\wupsvc.jpg	powershell.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
3056	reg.exe

Runs net.exe

Suspicious behavior: EnumeratesProcesses 15 IoCs

pid	Process
4796	powershell.exe
4796	powershell.exe
4796	powershell.exe
1836	powershell.exe
1836	powershell.exe
1836	powershell.exe
3336	powershell.exe
3336	powershell.exe
3336	powershell.exe
2652	powershell.exe
2652	powershell.exe
2652	powershell.exe
4796	powershell.exe
4796	powershell.exe
4796	powershell.exe

Suspicious behavior: LoadsDriver 1 IoCs

pid	Process
620	Process not Found

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	4796	powershell.exe
Token: SeDebugPrivilege	1836	powershell.exe
Token: SeDebugPrivilege	3336	powershell.exe
Token: SeDebugPrivilege	2652	powershell.exe

Suspicious use of WriteProcessMemory 63 IoCs

description	pid	Process	procid_target
PID 4684 wrote to memory of 4796	4684	6d6134155811eb82705509295bd4b87c6aaad43c1b54048c20d3cbf680494dfb.exe	69
PID 4684 wrote to memory of 4796	4684	6d6134155811eb82705509295bd4b87c6aaad43c1b54048c20d3cbf680494dfb.exe	69
PID 4684 wrote to memory of 4796	4684	6d6134155811eb82705509295bd4b87c6aaad43c1b54048c20d3cbf680494dfb.exe	69
PID 4796 wrote to memory of 4984	4796	powershell.exe	71
PID 4796 wrote to memory of 4984	4796	powershell.exe	71
PID 4796 wrote to memory of 4984	4796	powershell.exe	71
PID 4984 wrote to memory of 5012	4984	csc.exe	72
PID 4984 wrote to memory of 5012	4984	csc.exe	72
PID 4984 wrote to memory of 5012	4984	csc.exe	72
PID 4796 wrote to memory of 1836	4796	powershell.exe	73
PID 4796 wrote to memory of 1836	4796	powershell.exe	73
PID 4796 wrote to memory of 1836	4796	powershell.exe	73
PID 4796 wrote to memory of 3336	4796	powershell.exe	75
PID 4796 wrote to memory of 3336	4796	powershell.exe	75
PID 4796 wrote to memory of 3336	4796	powershell.exe	75
PID 4796 wrote to memory of 2652	4796	powershell.exe	77
PID 4796 wrote to memory of 2652	4796	powershell.exe	77
PID 4796 wrote to memory of 2652	4796	powershell.exe	77
PID 4796 wrote to memory of 4440	4796	powershell.exe	79
PID 4796 wrote to memory of 4440	4796	powershell.exe	79
PID 4796 wrote to memory of 4440	4796	powershell.exe	79
PID 4796 wrote to memory of 3056	4796	powershell.exe	80
PID 4796 wrote to memory of 3056	4796	powershell.exe	80
PID 4796 wrote to memory of 3056	4796	powershell.exe	80
PID 4796 wrote to memory of 4220	4796	powershell.exe	81
PID 4796 wrote to memory of 4220	4796	powershell.exe	81
PID 4796 wrote to memory of 4220	4796	powershell.exe	81
PID 4796 wrote to memory of 4596	4796	powershell.exe	82
PID 4796 wrote to memory of 4596	4796	powershell.exe	82
PID 4796 wrote to memory of 4596	4796	powershell.exe	82
PID 4596 wrote to memory of 2824	4596	net.exe	83
PID 4596 wrote to memory of 2824	4596	net.exe	83
PID 4596 wrote to memory of 2824	4596	net.exe	83
PID 4796 wrote to memory of 2628	4796	powershell.exe	84
PID 4796 wrote to memory of 2628	4796	powershell.exe	84
PID 4796 wrote to memory of 2628	4796	powershell.exe	84
PID 2628 wrote to memory of 4136	2628	cmd.exe	85
PID 2628 wrote to memory of 4136	2628	cmd.exe	85
PID 2628 wrote to memory of 4136	2628	cmd.exe	85
PID 4136 wrote to memory of 3636	4136	cmd.exe	86
PID 4136 wrote to memory of 3636	4136	cmd.exe	86
PID 4136 wrote to memory of 3636	4136	cmd.exe	86
PID 3636 wrote to memory of 648	3636	net.exe	87
PID 3636 wrote to memory of 648	3636	net.exe	87
PID 3636 wrote to memory of 648	3636	net.exe	87
PID 4796 wrote to memory of 1016	4796	powershell.exe	88
PID 4796 wrote to memory of 1016	4796	powershell.exe	88
PID 4796 wrote to memory of 1016	4796	powershell.exe	88
PID 1016 wrote to memory of 4636	1016	cmd.exe	89
PID 1016 wrote to memory of 4636	1016	cmd.exe	89
PID 1016 wrote to memory of 4636	1016	cmd.exe	89
PID 4636 wrote to memory of 4376	4636	cmd.exe	90
PID 4636 wrote to memory of 4376	4636	cmd.exe	90
PID 4636 wrote to memory of 4376	4636	cmd.exe	90
PID 4376 wrote to memory of 3932	4376	net.exe	91
PID 4376 wrote to memory of 3932	4376	net.exe	91
PID 4376 wrote to memory of 3932	4376	net.exe	91
PID 4796 wrote to memory of 5032	4796	powershell.exe	93
PID 4796 wrote to memory of 5032	4796	powershell.exe	93
PID 4796 wrote to memory of 5032	4796	powershell.exe	93
PID 4796 wrote to memory of 5036	4796	powershell.exe	94
PID 4796 wrote to memory of 5036	4796	powershell.exe	94
PID 4796 wrote to memory of 5036	4796	powershell.exe	94

C:\Users\Admin\AppData\Local\Temp\6d6134155811eb82705509295bd4b87c6aaad43c1b54048c20d3cbf680494dfb.exe
"C:\Users\Admin\AppData\Local\Temp\6d6134155811eb82705509295bd4b87c6aaad43c1b54048c20d3cbf680494dfb.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4684
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" -ep bypass & 'C:\Users\Admin\AppData\Local\Temp\\ready.ps1'
  2⤵
  - Drops file in System32 directory
  - Drops file in Windows directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4796
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\rlmeisxk\rlmeisxk.cmdline"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4984
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
      C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RESF7F7.tmp" "c:\Users\Admin\AppData\Local\Temp\rlmeisxk\CSC4A66E73C306D4AD9B2C12ABD8513448.TMP"
      4⤵
      PID:5012
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -Version 5.1 -s -NoLogo -NoProfile
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1836
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -Version 5.1 -s -NoLogo -NoProfile
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3336
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -Version 5.1 -s -NoLogo -NoProfile
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2652
- - C:\Windows\SysWOW64\reg.exe
    "C:\Windows\system32\reg.exe" ADD "HKLM\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" /v PortNumber /t REG_DWORD /d 0x1C21 /f
    3⤵
    PID:4440
- - C:\Windows\SysWOW64\reg.exe
    "C:\Windows\system32\reg.exe" add HKLM\system\currentcontrolset\services\TermService\parameters /v ServiceDLL /t REG_EXPAND_SZ /d C:\Windows\branding\mediasrv.png /f
    3⤵
    - Modifies registry key
    PID:3056
- - C:\Windows\SysWOW64\reg.exe
    "C:\Windows\system32\reg.exe" add "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" /v fEnableWddmDriver /t reg_dword /d 0 /f
    3⤵
    PID:4220
- - C:\Windows\SysWOW64\net.exe
    "C:\Windows\system32\net.exe" localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4596
  - - C:\Windows\SysWOW64\net1.exe
      C:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
      4⤵
      PID:2824
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" /c cmd /c net start rdpdr
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2628
  - - C:\Windows\SysWOW64\cmd.exe
      cmd /c net start rdpdr
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4136
    - - C:\Windows\SysWOW64\net.exe
        
        net start rdpdr
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:3636
      - C:\Windows\SysWOW64\net1.exe
        
        C:\Windows\system32\net1 start rdpdr
        6⤵
        
        PID:648
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" /c cmd /c net start TermService
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1016
  - - C:\Windows\SysWOW64\cmd.exe
      cmd /c net start TermService
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4636
    - - C:\Windows\SysWOW64\net.exe
        
        net start TermService
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:4376
      - C:\Windows\SysWOW64\net1.exe
        
        C:\Windows\system32\net1 start TermService
        6⤵
        
        PID:3932
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f
    3⤵
    PID:5032
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f
    3⤵
    PID:5036

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Account Manipulation

T1098

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Account Manipulation

T1098

Discovery

Lateral Movement

Remote Desktop Protocol

T1076

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1836-412-0x0000000008EE0000-0x0000000008EE1000-memory.dmp

Filesize
4KB

Download
memory/1836-198-0x0000000008CE0000-0x0000000008D13000-memory.dmp

Filesize
204KB

Download
memory/1836-186-0x0000000004D40000-0x0000000004D41000-memory.dmp

Filesize
4KB

Download
memory/1836-187-0x0000000004D42000-0x0000000004D43000-memory.dmp

Filesize
4KB

Download
memory/1836-206-0x0000000008CC0000-0x0000000008CC1000-memory.dmp

Filesize
4KB

Download
memory/1836-207-0x000000007EBD0000-0x000000007EBD1000-memory.dmp

Filesize
4KB

Download
memory/1836-212-0x0000000008E10000-0x0000000008E11000-memory.dmp

Filesize
4KB

Download
memory/1836-213-0x0000000008FE0000-0x0000000008FE1000-memory.dmp

Filesize
4KB

Download
memory/1836-406-0x0000000008EF0000-0x0000000008EF1000-memory.dmp

Filesize
4KB

Download
memory/2652-697-0x0000000004F72000-0x0000000004F73000-memory.dmp

Filesize
4KB

Download
memory/2652-792-0x000000007FA90000-0x000000007FA91000-memory.dmp

Filesize
4KB

Download
memory/2652-696-0x0000000004F70000-0x0000000004F71000-memory.dmp

Filesize
4KB

Download
memory/3336-467-0x000000007EAF0000-0x000000007EAF1000-memory.dmp

Filesize
4KB

Download
memory/3336-442-0x00000000071E2000-0x00000000071E3000-memory.dmp

Filesize
4KB

Download
memory/3336-441-0x00000000071E0000-0x00000000071E1000-memory.dmp

Filesize
4KB

Download
memory/4684-120-0x0000000005862000-0x0000000005863000-memory.dmp

Filesize
4KB

Download
memory/4684-115-0x0000000005C80000-0x000000000607F000-memory.dmp

Filesize
4.0MB

Download
memory/4684-123-0x0000000008650000-0x0000000008651000-memory.dmp

Filesize
4KB

Download
memory/4684-122-0x00000000061A0000-0x00000000061A1000-memory.dmp

Filesize
4KB

Download
memory/4684-121-0x0000000005863000-0x0000000005864000-memory.dmp

Filesize
4KB

Download
memory/4684-117-0x0000000006580000-0x0000000006581000-memory.dmp

Filesize
4KB

Download
memory/4684-118-0x0000000006220000-0x0000000006221000-memory.dmp

Filesize
4KB

Download
memory/4684-119-0x0000000005860000-0x0000000005861000-memory.dmp

Filesize
4KB

Download
memory/4684-124-0x0000000005864000-0x0000000005865000-memory.dmp

Filesize
4KB

Download
memory/4796-134-0x00000000080F0000-0x00000000080F1000-memory.dmp

Filesize
4KB

Download
memory/4796-138-0x0000000008A10000-0x0000000008A11000-memory.dmp

Filesize
4KB

Download
memory/4796-153-0x0000000009790000-0x0000000009791000-memory.dmp

Filesize
4KB

Download
memory/4796-131-0x0000000007FF0000-0x0000000007FF1000-memory.dmp

Filesize
4KB

Download
memory/4796-136-0x00000000051D0000-0x00000000051D1000-memory.dmp

Filesize
4KB

Download
memory/4796-137-0x00000000051D2000-0x00000000051D3000-memory.dmp

Filesize
4KB

Download
memory/4796-145-0x0000000009700000-0x0000000009701000-memory.dmp

Filesize
4KB

Download
memory/4796-128-0x0000000005220000-0x0000000005221000-memory.dmp

Filesize
4KB

Download
memory/4796-1126-0x000000007EF40000-0x000000007EF41000-memory.dmp

Filesize
4KB

Download
memory/4796-155-0x00000000051D3000-0x00000000051D4000-memory.dmp

Filesize
4KB

Download
memory/4796-135-0x0000000008AE0000-0x0000000008AE1000-memory.dmp

Filesize
4KB

Download
memory/4796-144-0x0000000009E30000-0x0000000009E31000-memory.dmp

Filesize
4KB

Download
memory/4796-176-0x0000000009B00000-0x0000000009B01000-memory.dmp

Filesize
4KB

Download
memory/4796-133-0x00000000082C0000-0x00000000082C1000-memory.dmp

Filesize
4KB

Download
memory/4796-129-0x0000000007920000-0x0000000007921000-memory.dmp

Filesize
4KB

Download
memory/4796-130-0x0000000007F50000-0x0000000007F51000-memory.dmp

Filesize
4KB

Download